A KBS /NHK Collaboration on the Imjin War . Sounds good so far.
Ryu Seong Ryong wrote an account of the Imjin War, so he is the subject of the 2015 Korean Historical drama .
NHK arranged for KBS to film scenes inside Osaka Castle and supplied all the costumes for the Samurai.

What could go wrong ?, no Japanese actors maybe?.
It is all in Korean ?

Despite that it does look good and for a change it deals with the land war and not Yi Sun Sin .